>>35422061weight of wishiwashi, normal form = 0.3 kg
weight of wishiwashi, school form = 78.6 kg
ratio is exactly 262 to 1
height of wishiwashi, normal form = 0.2m
volume of wishiwashi, normal form = K * 0.008 m3 for a constant K that describes the shape of the wishiwashi
height of wishiwashi, school form = 8.2m
volume of wishiwashi, school form = K * 551.368 m3 for the same K, since the shape of the school form is roughly the same as that of the normal form
ratio is exactly 68,921 to 1, which is roughly the square (not cube) of 262
So either most of the wishiwashi are really light, most of a school is empty space, or the Pokédex is bullshit as usual